857253871 has 4 divisors (see below), whose sum is σ = 878162544. Its totient is φ = 836345200.

The previous prime is 857253869. The next prime is 857253877. The reversal of 857253871 is 178352758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 857253871 - 2¹ = 857253869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857253877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10454275 + ... + 10454356.

It is an arithmetic number, because the mean of its divisors is an integer number (219540636).

Almost surely, 2^857253871 is an apocalyptic number.

857253871 is a deficient number, since it is larger than the sum of its proper divisors (20908673).

857253871 is a wasteful number, since it uses less digits than its factorization.

857253871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20908672.

The product of its digits is 470400, while the sum is 46.

The square root of 857253871 is about 29278.8980496193. The cubic root of 857253871 is about 949.9552595735.

The spelling of 857253871 in words is "eight hundred fifty-seven million, two hundred fifty-three thousand, eight hundred seventy-one".